Anyone that has worked with seismic data in the last 40 or so years will be familiar with the SEG-Y seismic data exchange standard. SEG-Y is one of several standards developed by the The Society of Exploration Geophysicists (SEG) for storing geophysical data. Originally developed to store single-line seismic reflection digital data on magnetic tape and first published in 1975, there has only been one major update, SEG-Y revision 1, which came out in 2002. Now SEG has announced the release of a major update to the venerable seismic workhorse.
The result of more than two years of development and feedback from a large community of users, SEG-Y Revision 2.0 provides high flexibility while maintaining a high degree of backward compatibility. It may be downloaded from the SEG Technical Standards web page (http://seg.org/Publications/SEG-Technical-Standards).
Notable new features include:
- Up to 65,535 additional 240-byte trace headers;
- The ability to unambiguously map trace-header contents;
- Capacity for traces to have up to 232–1 samples and 264–1 traces per line and ensemble;
- Sample intervals can be arbitrarily large or small;
- Support for little-endian and pair-wise byte swapping;
- Microsecond time-stamp accuracy;
- Higher-precision coordinates, depths and elevation;
- Depth, velocity, electromagnetic, gravity and rotational sensor data types;
- Optional XML-based Extended Textual File Headers